But why do people feel so betrayed after older votes and actions should have triggered this much earlier? And will most of this go away soon?

Many still hope for the magical day when the dems become something that they structurally cant be. They love the idea more than the fact, of what these people represent. Same with Mamdani, tbh. People will be very heartbroken about him soon enough.

Too much “benefit of the doubt” is given, too much projection and power-level hiding cope and “they mean well”. They long to be heard and hear screams in whimpers.